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The only difference to your set up is that I have the drysuit inflator to the left (from the left post). If you then make sure that the connections to the wing and the drysuit are the same then the wing and drysuit hoses become interchangable for emergencies. You then only need to carry one low pressure hose in your spares box as well. If you get some of the ap valves low pressure connections then the hoses can be cut down to the exact size required.
You only need one spg and this comes from the left post. If you have a problem from behind the head and you can't work out what it is then you shut down the isolator. A quick glance at the spg will tell you which post the problem is with. If the spg is moving then it's the left post. If it's not then it's the right post and you act accordingly. The spg being on the left post can also tell you if you've rolled off the left post or forgot to open the isolator before you've got in (yes it does happen) as it doen't move during the dive (you're breathing the long hose from the right post).
If you have to shut down any of the posts or isolate the cylinders then the dive is over and therefore you don't need to know what gas you have left. You should have been planning the dive on the rule of thirds and therefore have enough gas to complete any deco requirements and get out ok without knowing what you've got left.
If everything doesn't go to plan and you manage to blow all your gas then you always have a completely independant supply at hand - your buddy, they are also part of your equipment and dive plan.  |